Examples of org.apache.derby.iapi.services.io.ArrayInputStream

Package org.apache.derby.iapi.services.io

Examples of org.apache.derby.iapi.services.io.ArrayInputStream

org.apache.derby.iapi.services.io.ArrayInputStream
An InputStream that allows reading from an array of bytes. The array of bytes that is read from can be changed without having to create a new instance of this class.

            long logEndInstant = LOG_FILE_HEADER_SIZE;


            StreamLogScan scanOfHighestLogFile =
                (StreamLogScan) openForwardsScan(startInstant,
                                                 (LogInstant)null);
            ArrayInputStream scanInputStream = new ArrayInputStream();
            while(scanOfHighestLogFile.getNextRecord(scanInputStream, null, 0)
                  != null){
                logEndInstant = scanOfHighestLogFile.getLogRecordEnd();
            }

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    {
        super.initialize();


        if (rawDataIn == null) 
        {
            rawDataIn            = new ArrayInputStream();
            checksum             = new CRC32();
        }


        if (pageData != null)
            rawDataIn.setData(pageData);

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                    "restoreRecordFromSlot called on an overflow page.");
            }


            // position the array reading stream at beginning of row data just
            // past the record header.
            ArrayInputStream lrdi = rawDataIn;
            lrdi.setPosition(offset_to_row_data);


            if (!recordHeader.hasOverflow())
            {
                if (isHeadRow)
                {
                    if (fetchDesc != null && 
                        fetchDesc.getQualifierList() != null)
                    {
                        fetchDesc.reset();


                        if (!qualifyRecordFromSlot(
                                row, 
                                offset_to_row_data, 
                                fetchDesc,
                                recordHeader,
                                recordToLock))
                        {
                            return(false);
                        }
                        else
                        {
                            // reset position back for subsequent record read.
                            lrdi.setPosition(offset_to_row_data);
                        }
                    }
                }


                // call routine to do the real work.  Note that

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                }
            }


            // position the array reading stream at beginning of row data 
            // just past the record header.
            ArrayInputStream lrdi = rawDataIn;
            lrdi.setPosition(offset_to_row_data);


            if (fetchDesc != null)
            {
                if (fetchDesc.getQualifierList() != null)
                {

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     **/
    private void readPageHeader() 
        throws IOException
    {
        // these reads are always against the page array
        ArrayInputStream lrdi = rawDataIn;


        lrdi.setPosition(PAGE_HEADER_OFFSET);
        long spare;


        isOverflowPage  =   lrdi.readBoolean();
        setPageStatus       (lrdi.readByte());
        setPageVersion      (lrdi.readLong());
        slotsInUse      =   lrdi.readUnsignedShort();
        nextId          =   lrdi.readInt();
        generation      =   lrdi.readInt();     // page generation (Future Use)
        prevGeneration  =   lrdi.readInt();     // previous generation (Future Use)
        bipLocation     =   lrdi.readLong();    // BIPage location (Future Use)


        // number of deleted rows on page, we start to store this release 2.0.
        // for upgrade reasons, a 0 on disk means -1, so, we subtract one here.
        deletedRowCount =   lrdi.readUnsignedShort() - 1;


        // the next 4 (total 22 bytes) are reserved for future
        spare           =   lrdi.readUnsignedShort();   
        spare           =   lrdi.readInt();     // used by encryption
        spare           =   lrdi.readLong();
        spare           =   lrdi.readLong();
    }

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                    "bad record offset found in getRecordPortionLength()");
            }
        }


        // these reads are always against the page array
        ArrayInputStream lrdi = rawDataIn;


        lrdi.setPosition(
            slotTableOffsetToFirstRecordLengthField - (slot * slotEntrySize));


        return( 
            (slotFieldSize == SMALL_SLOT_SIZE) ?
                lrdi.readUnsignedShort() : lrdi.readInt());
    }

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                    "bad record offset found in getReservedCount");
            }
        }


        // these reads are always against the page array
        ArrayInputStream lrdi = rawDataIn;


        lrdi.setPosition(
            slotTableOffsetToFirstReservedSpaceField - (slot * slotEntrySize));


        return( 
            (slotFieldSize == SMALL_SLOT_SIZE) ?
                lrdi.readUnsignedShort() : lrdi.readInt());
    }

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            }


            int numberFields = recordHeader.getNumberFields();


            // these reads are always against the page array
            ArrayInputStream lrdi = rawDataIn;


            // position after the record header, at 1st column.
            lrdi.setPosition(offset + recordHeader.size());
        
            for (int i = 0; i < numberFields; i++) 
            {
                int fieldStatus = StoredFieldHeader.readStatus(lrdi);
                if (StoredFieldHeader.isOverflow(fieldStatus))
                    return false;


                int fieldLength = 
                    StoredFieldHeader.readFieldDataLength(
                        lrdi, fieldStatus, slotFieldSize);


                if (fieldLength != 0)
                    lrdi.setPosition(lrdi.getPosition() + fieldLength);
            }
        } 
        catch (IOException ioe) 
        {
            throw dataFactory.markCorrupt(

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            StoredRecordHeader recordHeader = getHeaderAtSlot(slot); 


            int numberFields    = recordHeader.getNumberFields();


            // these reads are always against the page array
            ArrayInputStream lrdi = rawDataIn;


            // position the stream to just after record header.
            int offset          = getRecordOffset(slot) + recordHeader.size();
            lrdi.setPosition(offset);


            for (int i = 0; i < numberFields; i++) 
            {
                int fieldStatus = StoredFieldHeader.readStatus(lrdi);
                int fieldLength = 
                    StoredFieldHeader.readFieldDataLength(
                        lrdi, fieldStatus, slotFieldSize);


                if (!StoredFieldHeader.isOverflow(fieldStatus)) 
                {
                    // skip this field, it is not an long column
                    if (fieldLength != 0)
                        lrdi.setPosition(lrdi.getPosition() + fieldLength);
                    continue;
                }
                else
                {

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                columnId >= recordHeader.getFirstField(),
                "first column on page > expected");
        }


        // these reads are always against the page array
        ArrayInputStream lrdi = rawDataIn;


        // set read position to data portion of record to check.
        int offset = getRecordOffset(slot);
        lrdi.setPosition(offset + recordHeader.size());


        // skip until you get to the record in question.
        for (int i = recordHeader.getFirstField(); i < columnId; i++)
            skipField(lrdi);

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Related Classes of org.apache.derby.iapi.services.io.ArrayInputStream

org.apache.derby.impl.store.raw.data.AllocPage

org.apache.derby.impl.store.raw.data.DirectActions

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org.apache.derby.impl.store.raw.data.StoredPage

org.apache.derby.impl.store.raw.log.FileLogger

org.apache.derby.impl.store.raw.log.LogToFile

org.apache.derbyTesting.unitTests.junit.ArrayInputStreamTest

java.io.UTFDataFormatException

java.io.EOFException

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